螺母式进线嘴,在进线嘴与密封圈之间缺少金属垫圈为失爆。()
参考答案:对
She likes talking to people, ______ she wants to be a reporter. [ ]
A. and
B. so
C. because
D. or
显微观察发现,卵黄膜和透明带的间隙有两个极体,不能由此得出的结论是()
A.已经受精
B.已经发生透明带反应
C.卵黄膜封闭应已经完成
D.正在形成卵丘细胞