场地人员将被吊钻杆或钻铤公扣端戴好（），滚到猫道中间位置。
参考答案：护丝
—Is Jessica giving us a speech this evening?
—No, it _________ be her．She _________ to Japan．
A．mustn't；has gone
B．mustn't; has been
C．can't; has gone
D．can't; has been
一个奶牛能量单位相当于3137千焦耳的产奶净能。（）
