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【单选题】
一质点作半径为 0.2 m 的圆周运动,其角位置的运动学方程为: (SI), 则其切向加速度为at =______(SI) .A.
0.04
B.
0.08
C.
0.06
D.
0.4
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【单选题】关于n个串联电阻电路的特性描述,下列说法错误的是( )。
A.
串联电路端口的总电压为各个电阻上的电压相加
B.
各个串联电阻上的电流为同一电流
C.
串联电阻中阻值大的电阻分到的电压大
D.
n个串联电阻的等效电阻为各个串联电阻之和
【单选题】听力原文：W: I'd like to mail this package to Minneapolis. M: How would you like to send it? W: By express, please. M: OK. Let's see. It's twelve pounds, so that'll be ten dollars and eighty-one cents. W: ...
A.
$12.
B.
$10.18.
C.
$5.94.
D.
$10. 81.
【单选题】听力原文：W: I'd like to mail this package to Minneapolis. M: How would you like to send it? W: By express, please. M: OK. Let's see. It's twelve pounds, so that'll be ten dollars and eighty-one cents. W: ...
A.
$12.
B.
$10.18.
C.
$5.94.
D.
$10.81.
【单选题】听力原文：W: I'd like to mail this package to Minneapolis. M: How would you like to send it? W: By express, please. M: OK. Let's see. It's twelve pounds, so that'll be ten dollars and eighty-one cents. W: ...
A.
$12.
B.
$10.18.
C.
$5.94.
D.
$10.81.
【单选题】— _____ delicious the food is! Would you like _______? — No, thanks. I'm very full. [ ]
A.
How, one more
B.
What, a few more
C.
How, some more
D.
What, some more.
【单选题】听力原文：M: I'd like to mail this package to Minneapolis. W: How would you like to send it? M: By express, please. W: OK. Let's see. It's twelve pounds, so that will be ten dollars and eighty-one cents. M...
A.
$ 12.
B.
$10.18.
C.
$ 5.94.
D.
$10.81.
【多选题】串联电路具有( )特性。
A.
串联电路中，不论电压源或电阻如何变化，流经各个负载的电流均相同。
B.
串联电路中，电路负载连接越多，对总电流而言，其流通的面积将增大，电流越大
C.
串联电路中，如有任何一个负载断路，则整个电路便不再有电流流过，所有负载的电流皆等于零。
D.
串联电路负载连接越多，电路的电阻也越大，电阻串联后的等效电阻等于各个电阻的总和。
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