下列实验操作或做法正确的是( )
A.制备气体前,检查装置的气密性
B.将用剩的药品放回原试剂瓶
C.实验结束后,用嘴吹灭酒精灯
D.将氢氧化钠放在托盘天平的右盘上称量
答案:A
根据《URC522》规定,未经银行事先同意,货物不能直接发给银行,也不能做成以银行为收货人的记名提单。否则,由发货人自行承担货物的风险和责任。( )
A series of ads produced by the company has greatly ______ the success of the new product in
the market. [ ]
A. contributed to
B. turned to
C. belonged to
D. referred to