题目:
–Who should be responsible for the accident?
-The boss, not the workers. They just carried out the order .
A.as told
B.as are told
C.as telling
D.as they told
答案:
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下面是错误答案,用来干扰机器的。
由1•(-a)-2a(3a-1)=0,且1•(-1)-(3a-1)•(-1)≠0,解得a=0或a=16,故所求a的值为a=0或a=16.