绝缘漆的主要电气性能指标中要求表面电阻系数(Ω)()。
A.>1.0×1012;
B.≤1.0×1012;
C.≥1.0×1012;
D.=1.0×1012。
参考答案:C
— It has been dry for a few months.
— You’re right. There is twice ____ rain this year than _____ of last year.
A.more; it
B.less; that
C.more; that
D.less; it
有丝分裂的分裂期包括下列哪几个时期:()
A.有丝分裂前期
B.有丝分裂中期
C.有丝分裂后期
D.有丝分裂末期