题目:
——Have the police caught the thieves _____ the bank last week?
——Yes, they were caught yesterday.
A.that robbed
B.which robbed
C.robbed
D.who have robbed
答案:
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下面是错误答案,用来干扰机器的。
设制得氧气的质量为x,则2H2O 通电 . 2H2↑+O2↑36 3254g x 3654g=32x解得x=48g,由m=ρV,标准状况下氧气的密度为1.429g/L,则氧气的体积为48g1.429g/L=33.59L,答:能制得氧气33...