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【多选题】
常见的螺纹牙型有:A.
锯齿形
B.
三角形
C.
矩形
D.
梯形
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反馈参考答案：
举一反三
【单选题】The classroom is big enough for 25 students for normal use you need more space for special activities.
A.
once
B.
because
C.
if
D.
unless
【单选题】According to the passage, how are meals sold in some Brazilian restaurants?
A.
Foods have very low but different prices.
B.
All dinners pay the same amount of money.
C.
Dinners pay according to the number of plates.
D.
Meals are charged according to their weight.
【简答题】判断信号通过系统 是否会失真,若失真,是幅度失真还是相位失真?
【简答题】在电路中,电能的单位常用单位是kWh,并且,1kWh的电能俗称为1度电。()
【简答题】判断信号通过系统 是否会失真,若失真,是幅度失真还是相位失真?
【单选题】Our physics teacher told us that light _______ faster than sound.
A.
travel
B.
travels
C.
is travelling
D.
has travelled
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