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【单选题】
在如图所示的实验装置中，用棉线将铜棒ab悬挂于磁铁N、S极之间，铜棒的两端通过导线连接到电流表上。下列说法中正确的是：（ ）A.
ab棒在图中位置水平左右运动时，应观察到电流表的指针发生偏转
B.
ab棒在图中位置竖直上下运动时，应观察到电流表的指针发生偏转
C.
该装置是研究磁场对通电导体的作用力方向与磁场方向的关系
D.
该装显在实验中通过磁场对电流的作用，使电能转化为机械能
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举一反三
【单选题】In our school, the students have three_____ courses, and seven______ entrepreneurial education courses .
A.
required; alternative
B.
requiring; alternative
C.
required; alternate
D.
requiring; alternate
【单选题】Put on dark glasses or the sun will ______ you and you won't be able to see.
A.
discern
B.
distort
C.
distract
D.
dazzle
【单选题】____ you won't be able to succeed.
A.
It is alike that
B.
It is like that
C.
The chances are that
D.
The chance is that
【单选题】In our school, the students have three _________courses and seven _________ courses. [ ]
A.
required ; alternative
B.
require ; alternative
C.
requiring ; alternative
D.
require ; alternate
【单选题】You won't be able to finish the job _______ you stop playing around.
A.
unless
B.
lest
C.
in case of
D.
so that
【单选题】For our middle school students, some courses are compulsory, while others are ______. [ ]
A.
flexible
B.
optional
C.
impressive
D.
significant
【单选题】飞行操纵系统中主操纵系统在飞行中的功用是
A.
用来操纵副翼、方向舵和升降舵的运动
B.
操纵飞机绕纵轴、立轴和横轴转动，以改变或保持飞机的飞行姿态
C.
操纵飞机沿纵轴、立轴和横轴运动，以改变或保持飞机的飞行姿态
D.
操纵飞机起飞、着陆和上升、下降
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