题目内容：
圆柱齿轮的齿形没有（）。A．直齿
B．斜齿
C．人字齿
D．矩形齿
参考答案：
单选：圆柱齿轮的齿形没有（）。A．直齿B．斜齿C．人字齿D．矩形齿
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A．直齿
B．斜齿
C．人字齿
D．矩形齿
A．直齿
B．斜齿
C．人字齿
D．矩形齿
下列为聚氧乙烯脂肪酸酯类表面活性剂的是（）A．司盘B．吐温C．苄泽D．卖泽
下列为聚氧乙烯脂肪酸酯类表面活性剂的是（）A．司盘B．吐温C．苄泽D．卖泽
I'll be away on a business trip. Would you mind looking after my catNot at...
I'll be away on a business trip. Would you mind looking after my catNot at...
流行性乙脑是由乙脑病毒感染所致，多发于（）A．夏秋季流行B．冬春季流行C．一年四季均可流行D．春秋季流行
流行性乙脑是由乙脑病毒感染所致，多发于（）A．夏秋季流行B．冬春季流行C．一年四季均可流行D．春秋季流行
Can you imagine the difficulty I had __________ language obstacles I first st...
Can you imagine the difficulty I had __________ language obstacles I first st...
Being__________ of money, she managed to save enough for a holiday. A. econom
Being__________ of money, she managed to save enough for a holiday. A. econom