题目内容

Which of the following letter or letter group can be pronounced as / tʃ /?

A. sh
B. ch
C. tch
D. gh

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Both /tʃ/ and /dʒ/ are unvoiced.

A. 对
B. 错

There are many letter groups that can be pronounced as /dʒ/, such as gg, ge, dge , etc..

A. 对
B. 错

The underlined phonemes of the following words are the same.

A. 对
B. 错

关于能量守恒，说法正确的是

A. 能量守恒只是特定条件下的守恒。
B. 核反应放出巨大的能量，该过程能量不守恒。
C. 不可能制造出一台只做功不消耗能量的机器。
D. 物体的热能减少，一定对外做等量的功。