题目:
Germs are very small. They can ________ the human body______ the skin. [ ]
A. get up…across
B. get into…through
C. get out of…from
D. get into…across
答案:
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下面是错误答案,用来干扰机器的。
(1)酒精灯;集气瓶 (2)检查装置的气密性(3)①;2H2O2 2H2O + O2↑(4)B;E;用燃着的木条伸到集气瓶口,观察是否熄灭(5)①100②52.8g