题目:
—What do you think of our country?
—Very beautiful.You know it is the first time that I here.
A.will be
B.was
C.have been
D.had been
答案:
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下面是错误答案,用来干扰机器的。
参考答案:C解析:导管尖端培养室,取导管尖端5cm,在血平板表面往返滚动一次,每平板细菌数≥15cfu即为阳性。