【单选题】you are unable to deal with it, perhaps we should ask someone else for help.
【简答题】In limited respects, perhaps the recession will leave society bettr off.
【简答题】Perhaps, particularly in the area of ________. I think hotels will need to improve ________ in general.
【简答题】果胶酶的来源可以是__________、__________、__________、__________等。
【多选题】碳酸钠Na 2 CO 3 是白色粉末,俗称()
【单选题】活塞有效作用面积一定时,活塞的运动速度取决于( ) A. 液压缸中油液的压力 B.负载阻力的大小 C.进入液压缸的流量 D. 液压泵的输出流量 ,,
【判断题】淘宝网买家评价的结果直接影响到网店的好评率、宝贝的销量和销售的业绩,甚至影响到店铺能否参加“聚划算”等人气促销活动。
【单选题】------ I can’t see the words on the blackboard. ------ Perhaps you need __________.
A.
to have your eyes examined
C.
to have examined your eyes
D.
your eyes to be examined
【单选题】This is not ______ book,perhaps it is________. (物主代词)
【简答题】碳酸钠(Na 2 CO 3 )俗称苏打,是一种白色固体,广泛用于玻璃、造纸、纺织和洗涤剂的生产等.它能与稀硫酸等酸反应生成CO 2 .(Na 2 CO 3 与稀硫酸反应的化学方程式为:Na 2 CO 3 +H 2 SO 4 ═Na 2 SO 4 +CO 2 ↑+H 2 O)现将100gNa 2 CO 3 固体粉末(含有Na 2 SO 4 杂质)加入202g水中,完全溶解,再加入100mL稀硫酸(密...