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[主观题]

Based on the results of Study 1, if the distance from the center of a 100 m ×100 m plot we

re 75 m from thenearest clearing, the expected average change inAGTB at the plot over 17 yr would be closest to whichof the following values?

A.–1.1 t/yr

B.–2.6 t/yr

C.+1.1 t/yr

D.+2.6 t/yr

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更多“Based on the results of Study 1, if the distance from the center of a 100 m ×100 m plot we”相关的问题

第1题

If, in Experiment 2, a 1.5 ×10–6F capacitor had been used, the time required for the volta

ge across thecapacitor to reach 6 V would have been closest to:

A.4.2 sec.

B.7.0 sec.

C.10.5 sec.

D.15.0 sec.

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第2题

According to Study 1, white S has a reflectance of 0.98at a wavelength of 0.60 μm. This me

ans that white Sreflects:

A.2% of the 0.60 μm wavelength light that strikes its surface.

B.98% of the 0.60 μm wavelength light that strikes its surface.

C.2% of all the visible light that strikes its surface.

D.98% of all the visible light that strikes its surface.

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第3题

Which of the following factors affecting the reaction of Mg and H2O was studied in Experim

ent1, but not inExperiments2 or 3?

A.Reaction temperature

B.Addition of NaCl

C.Addition of Fe

D.Surface area of Mg

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第4题

According to Scientist 2’s viewpoint, compared to thealtitude at which a stony asteroid wo

uld have explodedin Earth’s atmosphere, a comet of similar size wouldmost likely have exploded at:

A.the same altitude.

B.a higher altitude.

C.a slightly lower altitude.

D.a much lower altitude.

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第5题

Hornfelsis a metamorphic rock formed when magma(molten rock) heats sedimentary rocks on Ea

rth’s sur-face. According to Figure 1, hornfels is most likely amember of which of the following facies?

A.Facies A

B.Facies C

C.Facies E

D.Facies G

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第6题

The scientist who describes the DNA Hypothesis implies that the Protein Hypothesis is weak

ened by which of the following observations?

A.For a given organism, the amount of protein in the gametes is half that found in other types of cells.

B.For a given organism, the amount of protein in different types of cells is not the same.

C.Protein molecules are composed of many subunits.

D.Proteins are found only in the nucleus.

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第7题

A student claimed that “If the masses of 1 cm3of any solid and 1 cm3of any liquid are comp

ared, the massof the solid will be greater.” Do the data in Table 1support his claim?

A.No; lead has a higher density than any of the liq-uids listed.

B.No; mercury has a higher density than any of the solids listed.

C.Yes; lead has a higher density than any of the liq-uids listed.

D.Yes; mercury has a higher density than any of the solids listed.

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第8题

Consider the following hypothesis: In a circuit arranged as in Figure 1 containing a batte

ry, a capaci-tor, and a constant resistance, as capacitance increases,the time required to reach a given voltage across thecapacitor increases. Do the experiments support thishypothesis?

A.Yes; in Experiment 1, as capacitance increased, the time required to reach a given voltage increased.

B.Yes; in Experiment 2, as capacitance increased, the time required to reach a given voltage increased.

C.No; in Experiment 1, as capacitance increased, the time required to reach a given voltage decreased.

D.No; in Experiment 2, as capacitance increased, the time required to reach a given voltage decreased.

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第9题

Based on the data in Figure2, at which of the fol-lowing pHs, if any, do EnzymesA andB hav

e thesame acceleration factor?

A.At pH 5 only

B.At pH 6.7 only

C.At all pHs between 2 and 11

D.At none of the pHs shown in the figure

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第10题

It has been observed that as Mg and H2O react, the Mg(OH)2(magnesium hydroxide) that is pr

oducedforms an unreactive coating on the Mg surface. Whichof the following models for why NaCl speeds up thereaction is most consistent with this observation andthe results of the experiments?

A.NaCl absorbs heat produced in the reaction, causing the Mg(OH)2to melt off of the Mg surface.

B.NaCl binds with Fe to inhibit the reaction of Mg with H2O.

C.NaCl reacts with Mg(OH)2to form a stronger bar-rier against H2O.

D.NaCl reacts with Mg(OH)2, removing the coating from the Mg, allowing more contact with H2O.

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