如图所示,物块所受重力为10N,放在光滑斜面上由一弹簧秤沿斜面拉住,使它静止。已知弹簧秤读数为6N,则斜面对物块的支持力大小为
A.4N
B.8N
C.10N
D.无法确定
B
When we came to the gate, he stopped ___________ me go in first. [ ]
A. to let
B. to tell
C. to allow
D. to ask
当归四逆汤的组成是()
A.桂枝汤倍芍药,重加饴糖
B.桂枝汤加当归、细辛、通草
C.桂枝汤去大枣,加当归、细辛、通草
D.桂枝汤去生姜,加当归、细辛、通草
E.桂枝汤去甘草,倍生姜,加黄芪