皮皮学，免费搜题
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【单选题】
磨削加工时,提高工件速度可使加工表面粗糙度值( )。A.
变大
B.
变小
C.
不变
D.
不一定
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知识点：
皮皮学刷刷变学霸
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【单选题】某校举行秋季运动会，七年级（1）班、（5）班实力相当，关于比赛结果，甲同学说，（1）班与（5）班得分比为6∶5；乙同学说，（1）班得分比（5）班得分的2倍少40分，若设（1）班得x分，（5）班得y分，根据题意所列的方程组应为 [ ]
A.
B.
C.
【简答题】调查你们班同学出生时的体重（或身高），然后将数据适当分组，并绘制相应的频数直方图，看看你们班大多数同学出生时的体重（或身高）处于哪个范围。
【单选题】That was the most interesting film_______I had ever seen. [ ]
A.
whose
B.
that
C.
which
D.
what
【单选题】Why the team believed that the four-foot mammoth tusk was the most important find?
A.
Because it was the longest tusk ever found.
B.
Because there were signs left by human's tools on it.
C.
Because there were grooves on it.
D.
Because there are not any mammoth tusk all over the world.
相关题目：
【单选题】That was the most interesting film_______I had ever seen. [ ]
A.
whose
B.
that
C.
which
D.
what