题目内容

By "But to a great extent it is not so" (Lines 6—7) the author implies that

A. most people are just followers of new ideas.
B. even sound minds may commit silly errors.
C. the popularly supported may be erroneous.
D. nobody is immune to the influence of errors.

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A. removing wrinkles from the face.
B. helping people make up.
C. enjoying operating.
D. refusing to operate.

A. 50sin(ωt-90°)A
B. 2sin(ωt+120°)A
C. 50sin(ωt+90°)A
D. 2sin(ωt-120°)A

A. 保持Ucc，RB一定，减小Rc
B. 保持Ucc，Rc一定，增大RB
C. 保持RB，Rc一定，增大Ucc
D. 无法实现

A. 正确
B. 错误