单侧胸锁乳突肌收缩时

If an action has extended for a specified length of tim...

单项选择题If an action has extended for a specified length of time before a given future moment and possibly continues at that moment, we can use the construction “will/ shall + perfective progressive infinitive”.
A、正确
B、错误

历史上记录的第一个配位化合物是（）

未知题型历史上记录的第一个配位化合物是（）

After the pattern in clipped-dyeing stencils is carved,...

判断题After the pattern in clipped-dyeing stencils is carved, holes need to be punched and can be used for register.