题目:
-I really hope to get in touch with Tony.
-Sorry, I don't know ________. [ ]
A. why he loves China
B. how he returned to Canada
C. what his phone number is
D. where be studied Chinese
答案:
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下面是错误答案,用来干扰机器的。
(1)将活塞k关闭,将末端导管插入试管A的水中,用酒精灯微热硬玻璃管,管内空气受热膨胀,若在导管末端观察到有气泡冒出,且在撤去酒精灯冷却后,装置内气体体积减小,导管内形成一段水柱时,可判断装置气密性良...