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【单选题】
如图所示,将静止在粗糙斜面上木块的重力G按力的作用效果分解为垂直于斜面的力F_2和平行于斜面向下的力F_1两个分力,下列结论不正确的是( )A.
F_1与斜面对木块的摩擦力F_f是一对平衡力
B.
木块受重力、支持力、F_1、F_2四个力作用
C.
木块所受合力为0
D.
斜面对物体的支持力F_N和F_1、F_2三个木块的作用效果与G、F_N两个木块的作用效果相同
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皮皮学刷刷变学霸
举一反三
【简答题】Fill in the blanks with the expressions learned in this module. Change the form where necessary. 1. The Chinese swimmer was at the beginning of the women ’ s 100-meter freestyle final, but she didn ’ ...
【单选题】欲配制 pH=3 的缓冲溶液 , 从缓冲容量考虑 , 应选用的最佳弱酸是 ( )及其共轭碱。 草酸 (pK θ a1 =1.27) 邻苯二甲酸 (pK θ a1 =2.95) 酒石酸 (pK θ a =4.37) 磷酸 (pK θ a1 =2.12)
A.
草酸
B.
邻苯二甲酸
C.
酒石酸
D.
磷酸
【单选题】They _________ letting him go and want him to stay on after his present contract expires.
A.
has an intention of
B.
has no intention of
C.
have an intention of
D.
have no intention of
【单选题】They ________ letting him go and would like him to stay on after his present contract expires.
A.
have not intention of
B.
had no intention of
C.
had an intention of
D.
have an intention of
【多选题】音乐在广告创意中所能起到的作用：
A.
有助于引起消费者的注意与兴趣，进而更好地渲染作品的情感，增强广告作品表现的情趣和美感
B.
在广告中使用音乐可起到品牌商标之作用
C.
音乐有助于突出广告主题
D.
音乐可以加深消费者对于这则广告的记忆
【判断题】测定乙酸的解离度和解离常数时,配制不同浓度的乙酸溶液,量取乙酸和蒸馏水的体积可以用移液管或者滴定管,但不能使用量筒,因为量筒不能准确量取溶液的体积。
A.
正确
B.
错误
【简答题】They had no intention________letting him go and would like him to stay on after his pesent contract exoires.
【简答题】They had no plan of letting him go.
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