There are some equations and statements about the electrostatic field E0 and induced electric field Ei. Which of them is correct？

A、The stopping voltage increases if the intensity of incoming light increases.

B、The stopping voltage increases if the frequency of incoming light increases.

C、An electron absorbs a photon so that it can escape from the metal surface.

D、If the frequency of incoming light is lower than the cutoff frequency, there is no photocurrent.

A．Some researchers are dubious of the feasibility of the research.

B．Private enterprise doesn't show the interest in the research.

C．There should be a balance between caution and audacity.

D．Many researchers have given up their research.

A．There are plenty of fishes in it.

B．It is a safe place for swimmers.

C．It is extremely salty.

D．No fish can be found in it.

A] Examinations in modern times are written, while in ancient times they are spoken.

[B] The objective test has advantages for testing a student’s memory of facts and details.

[C] The objective test is the only way to test a student’s memory of facts and details,.

[D] Each objective question has more than one correct answer

A、At any position inside the conductor, E= 0.

B、All electrostatic charges carried by the conductor will be on the surface.

C、The electric potential has the same value at any position on the conductor.

D、If a conductor is connected to the ground, it carries no electrostatic charge.

A．Examinations in modern times are written, while in ancient times they are spoken.

B．The objective test has advantages for testing a student's memory of facts and details.

C．The objective test is the only way to test a student's memory of facts and details.

D．Each objective question has more than one correct answer.

A.Both the elasticities and absorption approaches consider trade and capital flows

B.Under the elasticities approach, currency depreciation will result in greater improvement in the trade deficit when either import or export demand becomes more elastic

C.Under the absorption approach, depreciation of the domestic currency will improve a trade deficit if it increases national expenditures relative to income

A、All of the charts are published on Friday nights.

B、There are both weekly charts and monthly charts.

C、The Official Charts Company (OCC) compiles various "official" UK record charts.

D、There are many different charts, such as the Official Singles Chart, Official Albums Chart, Official Compilations Chart, etc.

Ⅰ.The primary purpose of such testing is to find errors.

Ⅱ.Such testing can demonstrate the existence of errors but cannot demonstrate the absence of errors.

A．Neither

B．I only

C．Ⅱonly

D．Ⅰand Ⅱ