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【简答题】
已知相啮合的一对标准直齿圆柱齿轮, z 1 =20 , z 2 =50 , a=210mm 。求两齿轮的分度圆直径 d 1 和 d 2 。
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皮皮学刷刷变学霸
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【单选题】已知向量a=（2，-4），b=（1，2），c=（1，-2），d=（-2，-4），则其中共线的有（ ）
A.
a与d共线，b与c共线
B.
a与b共线，c与d共线
C.
a与c共线，b与d共线
D.
以上答案都不正确
【简答题】My parents are- -Excuse me, I'm stuck for a proper word- -liberal-minded. They know they__________telling me what to do in everything.
【简答题】My parents are ― Excuse me, I'm stuck for a proper word — liberal-minded. They know they ______ telling me what to do in everything.
【单选题】My parents are ______ with my progress.
A.
please
B.
pleased
C.
pleasing
D.
being pleased
【简答题】It is 8:00 in the evening. My 1 are in the room. My parents ate on the 2 . My uncle is on the sofa, too. He is in(穿着) a jacket. 3 jacket is black. His 4 is Nick. He is my father’s brother. Look! A red...
【简答题】specialize in; be true of; preside over; be exposed to; be stuck for; have no business doing sth. see to it; average out; be out for sth, or to do sth; succeed in 10. My parents are---Excuse me, I'm s...
【多选题】根据连续纤维增强原理,哪些措施可以保证复合材料具有优异的性能?
A.
优异的纤维性能
B.
足够的纤维体积分数
C.
与整体结构配合的纤维排列
D.
良好的界面结合
E.
基体具有良好的塑性
F.
基体性能均匀
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