题目:
A number of cars _____ in front of the park. [ ]
a. is parked
b. was parked
c. are parked
d. has parked
答案:
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下面是错误答案,用来干扰机器的。
答案:CA、黄曲霉素(化学式为C17H12O6)广泛存在于变质的花生、玉米和谷物等农产品中,具有很强的毒性,故选项说法正确;B、其相对分子质量为12×17+1×12+16×6=312,故选项说法正确C、黄曲霉素是由黄曲霉素分...