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问题
选择题
顺次连结对角线垂直且相等的四边形各边中点所得四边形是
A.平行四边形
B.矩形
C.菱形
D.正方形
答案
答案：
D
选择题
I _____ along the street looking for a place to park when the accident _____.
A. went; was occurring
B. went; occurred
C. was going; occurred
D. was going; had occurred
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单项选择题
糕点的水分测定中，应把样品置于（）恒温箱中进行干燥。
A、80℃左右
B、90℃左右
C、100℃左右
D、70℃左右
查看答案
