题干
—______does he have P.E.?
—He has P.E．at 3:00 in the afternoon?
A：When
B：What
C：Where
D：Why
答案(点此获取答案解析）
A
—______does he have P.E.?
—He has P.E．at 3:00 in the afternoon?
A：When
B：What
C：Where
D：Why
的光滑斜面上，当细绳由水平方向逐渐向上偏移时，细绳上的拉力将 ( )
