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【单选题】
对发电机电源频率的调整，说法正确的是（）.A.
电源频率是固定的，不可以对发电机的频率进行调整
B.
调整电源频率的位置是在发电机上
C.
调整电源频率的位置在CSD上
D.
每调整一圈，电源频率改变20hz
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反馈参考答案：
举一反三
【单选题】Yellow is the colour of the sun, so it can ______ you of a warm, sunny day. [ ]
A.
remember
B.
recommend
C.
remind
D.
require
【简答题】Today is a ________ (sun, sunny) day.
【单选题】People like wearing ____ on a sunny day. [ ]
A.
a glass
B.
glass
C.
glasses
D.
the glass
【单选题】听力原文：Would you like to go hiking on Saturday? (A) It was a beautiful, sunny day. (B) That'd be great. Where'd you like to go? (C) We're going for the whole day. (5)
A.
B.
C.
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