发电机组空载试机持续时间不宜太短．
参考答案：错
The doctor said that you are _________, so you’d better have a healthy diet and try your best to lose your weight.
A．thin
B．overweight
C．slim
D．energetic
X染色体包括在
A．B组染色体中
B．C组染色体中
C．D组染色体中
D．E组染色体中
E．F组染色体中
