与直齿圆柱齿轮机构比较，斜齿圆柱齿轮机构的下列特点中哪一条不是优点？（     ）
A、工作平稳，噪声小
B、承载能力大
C、改变β可凑得所需的中心距
D、有轴向力作用于轴和轴承

The loose sentence is simple and natural, so theadvanta...

判断题The loose sentence is simple and natural, so theadvantage of the loose sentence is that it is usually smooth,flowing, and conversational.()

“Have you finished your exercise yet?”属于提问语，不是指令语。 ...

判断题“Have you finished your exercise yet?”属于提问语，不是指令语。
正确
错误

set1={15,16,17,18} for i in set1:     print(i, end=" ")...

判断题set1={15,16,17,18}
for i in set1:
    print(i, end=" ")
以上程序段的输出结果一定是：15 16 17 18