A.刚性大、抗冲击
B.透光性好、隔热保温
C.耐候性好、不老化
D.长期允许使用温度为-20℃~30℃
E.被火燃烤可产生有害气体
第1题
Curves of the Maxwell distribution function for a fixed amount of ideal gas at temperature Ta and Tb are shown in figure. The temperature of ________(a or b) is higher.
第2题
第3题
The figure shows the curves of two simple harmonic motions. If the two simple harmonic motions can be superimposed the initial phase of the resultant cosine oscillation is ().
A、0
B、
C、
D、
第4题
.
A. fresh water cooling system and sea water system
B. sea water cooling system and lubricating oil cooling system
C. fresh water cooling system and lubricating oil cooling system
D. jacket cooling system and piston cooling system
第6题
Suppose that a new drug has been approved to treat a lifethreatening disease. The demand for that drug is shown on the graph below. Prior to approval of this drug, the only treatment for this condition was any one of several nonprescription, or overthecounter, pain relievers. The demand for one brand of the several nonprescription pain relievers is also shown on the graph.At a price of $15 (the price at which the two demand curves intersect), the price elasticity of demand for the new drug is ______ the price elasticity of demand for the overthecounter pain reliever.
A、greater than
B、less than
C、the same as
D、the reciprocal of
第7题
Investigations have shown that the two brothers meddled in state affairs.
A.Y
B.N
C.NG
第9题
Shown are the electric field lines for two point charges with a small distance b apart. The ratio q1/q2 equals
A、3.
B、-3.
C、1/3.
D、-1/3.
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