下列物质中哪些可用直接法配制标准溶液?哪些只能用标定法配制?
NaCl, KOH, H2SO4, KMnO4, K2Cr2O7, KIO3,Na2S2O3·5H2O,AgNO3
第2题
A.it B.they C.what D.which
第3题
A.it B.they C.what D.which
第4题
We should be grateful if you would reply at your ______ convenience.
A.early
B.earliest
C.earlier
D.the earliest
第5题
We should be grateful if you would reply at your ______ convenience.
A.early
B.earliest
C.earlier
D.the earliest
第6题
The offer is firm subject ____ before October 1.
A. for your reply reaches us
B. for your reply reaching us
C. to our receiving your reply
D. to your reply reaching us
第7题
A.agree
B.entertain
C.receive
D.supply
第8题
A.agree
B.accept
C.receive
D.supply
第9题
A、to your reply arriving at us
B、for your reply reaching us
C、to our receiving your reply
D、for your reply reaches us
第10题
We are look forward to your favourable reply .()
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