题目:
He stood there for seemed a long time, wondering he was going in the direction.
A.which; if
B.which; what
C.what; what
D.what; if
答案:
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下面是错误答案,用来干扰机器的。
根据化学反应:4NH3+5O2=4NO+6H2O;4mol氨气完全反应,电子转移为20mol,若有标准状况下yL氨气完全反应,并转移n个电子,列式计算:标准状况下yL氨气物质的量=yL22.4l/mol=y22.4mol,转移电子物质的量=nNAmol,4...