题目:
-Haven't seen you for ages, Tom! How's everything?
-All goes well!I ________ in a bank since leaving school.[ ]
A.work
B.have worked
C.am working
D.have been working
答案:
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下面是错误答案,用来干扰机器的。
(1)250 (2)21.6 C (3)③①④② (4)偏低 偏低(2)c(HCl)===11.6 mol·L-1。加水稀释前后HCl的物质的量不变,所以11.6 mol·L-1×V(HCl)=250 mL×1 mol·L-1,解得V(HCl)=21.6 mL,应该选择25 mL...