皮皮学，免费搜题
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【多选题】
控制无关变量的方法有哪些?A.
随机化
B.
消除
C.
恒定
D.
盲法
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】一对渐开线标准直齿圆柱齿轮正确啮合的条件是（）。
A.
模数和压力角分别相等
B.
重合度必须大于1
C.
模数相等，压力角和齿数可不同
D.
模数不相等，压力角和齿数相等
【单选题】He was ________ when the customs officers found drugs in his bag. [ ]
A.
argued
B.
fought
C.
persuaded
D.
arrested
【简答题】1 渐开线标准直齿圆柱齿轮正确啮合的条件是 和 分别相等。
【单选题】Customs officers at a London airport yesterday found $ 500 000 worth of drugs which were being smuggled into Britain in boxes marked 'Urgent Medical Supplies. ' The 【B1】 might have suspected for some ...
A.
authorities
B.
commanders
C.
leaders
D.
directors
【单选题】One of the customs officers, who was watching the arrivals very ________, saw feathers ________ from under a woman’s coat.
A.
closely; falling
B.
close; fall
C.
closely; fall
D.
close; falling
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