问题
选择题
I found that the young man was always spying ________ me all the way, so I glared ________ him.[ ]
A. at; with
B. on; with
C. at; on
D. on; at
答案
答案：D
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I found that the young man was always spying ________ me all the way, so I glared ________ him.[ ]
A. at; with
B. on; with
C. at; on
D. on; at
答案：D
），静止在水平面上，当将一质量为m的木块放在斜面上时正好匀速下滑．如果用与斜面成α角的力F拉着木块匀速上滑（木块匀速上滑过程木楔仍在水平面上静止），如图所示，