过定点A(0,-1,4)与直线平行的直线方程为()。
A.
B.
C.
D.
参考答案:C
—Look! The man at the gate be our headmaster. He stands there every morning.
—No, it be him. He is holding a meeting in the office now.
A.must; can’t
B.must; can
C.can’t; mustn’t
D.can’ t; must
粉液型塑料混合调拌后,下列哪种因素对其聚合的速度影响最大()
A.湿度
B.温度
C.搅拌方法
D.单体量
E.光线