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【单选题】
三条无限长直导线等距地并排放置,导线I、II、III分别载有 1 A , 2 A , 3 A 的同方向电流。由于磁相互作用的结果,导线I,II,III单位长度上分别受力 F 1 、 F 2 和 F 3 ,如图所示。则 F 1 与 F 2 之比为A.
7:16
B.
5:8
C.
7:8
D.
5:4
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【单选题】For someone who feels he must act, it is very likely that______.
A.
he will become a film star at long last
B.
he will be well paid
C.
he will end up without becoming a film star
D.
he will become a stage manager
【单选题】关于四行程发动机工作原理,下列说法错误的是( )。
A.
依次完成进气、压缩、做功、排气，一个工作循环曲轴转过了720°
B.
多缸发动机曲轴每转二圈，每个气缸都要作功一次
C.
各气缸完成一个工作循环，其进排气门各开启二次
D.
在发动机四个冲程中，只有做功冲程向外输出功率
【简答题】We had a very ____________ (tire) day yesterday.
【简答题】A．He must be a very strong man. B．He or she must have technical knowledge. C．He or she be able to read and speak English D．He or she be a very wealthy businessperson.
【单选题】He is very rich, so he______.
A.
must make a fortune
B.
should have made a fortune
C.
must have made a fortune
D.
should make a fortune
【单选题】He fell asleep immediately last night. He ______ very tired.
A.
must be
B.
must have been
C.
can be
D.
could have been
【单选题】对于四冲程发动机来说,每一个工作循环中只有一个行程对外输出功率,而其余三个行程都要消耗功,这个对外输出功率的行程是( )
A.
进气行程
B.
压缩行程
C.
做功行程
D.
排气行程
【单选题】He was taken away by the police. He _________ a very serious crime.
A.
must be committed
B.
was being committed
C.
must commit
D.
must have committed
【判断题】四冲程发动机每个工作循环中,只有 作功冲程 产生动力,即每转两圈有半圈作功,进气、压缩和排气三个冲程都是为作功冲程服务的辅助冲程,只消耗动力,不作功。
A.
正确
B.
错误
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