A pet owner must be nice to his pet, hoping that the pet keeps his company forever.
A. Yes
B. No
C. Not Given
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A dog will retreat when it encounters tough difficulties.
A. Yes
B. No
C. Not Given
When the owner becomes poor and his fame is ruined, the dog's love remains constant just like sunrise and sunset.
A. Yes
B. No
C. Not Given
在高温高压下，氢与钢中的碳发生反应生成甲烷气体，从而导致钢的塑性降低，这种现象叫做（)
A. 氢化物脆性；
B. 氢蚀；
C. 白点；
D. 氢致滞后断裂
（），杨成武走上了革命征程。
A. 北伐战争时期
B. 土地革命时期
C. 抗日战争时期
D. 解放战争时期
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