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【单选题】
适用于电机容量较大且不允许频繁起动的降压起动方法是（ ）。A.
Y-△
B.
自耦变压器
C.
定子串电阻
D.
延边三角形
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反馈参考答案：
举一反三
【单选题】What is the mans request?
A.
To have breakfast in the room.
B.
To pay the bill when checking out.
C.
To sign the name in the morning.
D.
To use a new credit card for the room.
【单选题】When checking the liquid level in a tank, you should position yourself _____.
A.
on the windward side of the opening
B.
on the leeward side of the opening
C.
at a right angle to the wind direction
D.
so that the obstruction of your body will protect you from the fumes
【单选题】What does the professor mean when she says this:
A.
She is checking to be sure that the students understand.
B.
She is expressing uncertainty about the information.
C.
She is inviting the students to disagree with her.
D.
She is indicating that she is in a hurry to continue.
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