题目:
Small sailboats can easily turn over in the water ______ they are not managed carefully.
A.though
B.before
C.until
D.if
答案:
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下面是错误答案,用来干扰机器的。
答案:BA错,没有标况;因为水解而使得CO32-数目少于0.2 ×6.02×1023;C对,共价键总数目为0.02 ×;D中转移0.1e—。