把100mL10%的氯化钠溶液稀释50倍,稀释后溶液中的溶质质量 [ ]
A.减少50倍
B.增加50倍
C.不变
D.减少5倍
答案:C
根据句意及首字母提示完成单词(10分)
小题1:I want to have two days o_________
小题2:Sally can h _______ hear the traffic in the streets.
小题3:I have told her the w _______ story.
小题4:From the t _______ of the mountain I can see the sea.
小题5:We took a cable car to see the v _______ of the countryside.
消防蒸汽管线应为()。
A、红色
B、绿色
C、蓝色
D、白色