The implementation of road pricing in London is primarily intended to
A. restrain the capital's traffic growth.
B. produce net annual municipal revenues.
C. remove on-street parking lots.
D. meet ambitious political aims.
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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.
The statement "draws the line at operating on people" (Para. 2) is closest in meaning to
A. removing wrinkles from the face.
B. helping people make up.
C. enjoying operating.
D. refusing to operate.
正弦电压υ的幅值为10V，其波形如图所示，施加于容抗Xc=5υ的电容元件上，通过该元件上的电流ic与u取关联正方向，则电流ic=()。
A. 50sin(ωt-90°)A
B. 2sin(ωt+120°)A
C. 50sin(ωt+90°)A
D. 2sin(ωt-120°)A
电路如图所示，设晶体管工作在放大状态，欲使静态电流Ic减小，则应()。
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
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