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【单选题】
电喇叭系统控制电路只需（）电流流过，而喇叭发声需要20 ~30A以上的电流。A.
10A
B.
0.25A
C.
20A
D.
30A
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知识点：
皮皮学刷刷变学霸
举一反三
【简答题】阅读下面的四份求职表,完成下面的判断,把名字写在相应的空格内。 1) ________ can join the basketball club. 2) ________ can join the teachers’ club. 3) ________ can join the IT club. 4) ________ can join the waiters’ club.
【单选题】The road is quiet. There ______ traffic even in the daytime.
A.
isn't much
B.
aren't many
C.
is few
D.
are little
【单选题】—It was cold and the road was icy. —It a comfortable journey.
A.
can’t be
B.
shouldn’t be
C.
mustn’t have been
D.
couldn’t have been
【单选题】关于电感的下列说法,错误的是______。
A.
电感在直流稳态电路中相当于短路
B.
电感处于交流电路中,总是吸收功率
C.
电感中的电流不能跃变
D.
电感是储能元件
【单选题】T he force that accelerates a car on a level road is exerted by the .
A.
road on the tires
B.
gears on the axle
C.
tires on the road
D.
engine on the gears
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