发电机并网后，可通过增减磁按钮进行有功的调整。
参考答案：错
—Where is our English teacher?
—He hasn't come to school today.I think he______be ill. [ ]
A. has to
B. should
C. may
D. can
体细胞突变可能的后果如下，除了（）
A.致癌
B.致畸
C.遗传性疾病
D.衰老
E.动脉粥样硬化
