超星 - 作业20211111

单选题

一半径为0.3 m的均匀带电球面,其电荷面密度为0.25 C/m2.若规定无穷远处为电势零点,则该球面上的电势为:

A. 7.2×108 V;
B. 8.5×109 V;
C. 9.4×1010 V;
D. 10.1×1011V.

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单选题

一金属球壳的内、外半径分别为0.2 m和0.4 m,带电荷为5 C.在球心处有一电荷为2.2 C的点电荷,则球壳外表面上的电荷面密度为:

A. 2.4 C/m2;
B. 3.1 C/m2;
C. 3.6 C/m2;
D. 7.2 C/m2;

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单选题

Of all the four candidates, he is the _______ likely to win.

A. less
B. least
C. little
D. last

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单选题

After they improved the production process, there were only _______ as before.

A. one-eighth as many defective products
B. as one-eighth many defective products
C. as many one-eighth defective products
D. defective products as one-eighth many

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单选题

There are _______ more people at the concert than I expected.

A. most
B. more
C. much
D. lot

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单选题

He is _______ taller than his younger brother.

A. a bit
B. bit
C. little
D. a few

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单选题

This copying machine is _______ that one in quality.

A. inferior
B. more inferior
C. inferior to
D. more inferior to

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单选题

The salary of a research engineer is higher than _______.

A. a quality engineer
B. a quality engineer’s
C. of a quality engineer
D. those of a quality engineer

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单选题

He speaks English _______ or better than he speaks German.

A. as well as
B. as well
C. as better
D. much well

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单选题

They successfully produced _______ than a finger tip.

A. a no bigger camera
B. no a bigger camera
C. no bigger a camera
D. a camera no bigger

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