注塑机的锁模力必须大于型腔内熔体压力与塑件及浇注系统在()之和的乘积。
参考答案:分型面上投影面积
根据课文填空
Water had also appeared on other planets like Mars but, 1 the earth,it had 2 later. It was not immediately obvious 3 water was to be 4 to the development of life. 5 many scientists believe is that the continued 6 of water allowed the earth to dissolve 7 gases and acids into the oceans and seas. This produced a 8 reaction, 9 made 10 possible for life to develop.
机械设备,主要是( )对工程质量有直接影响。
A.办公用设备
B.垂直和横向运输设备
C.施工安全设备
D.测量仪器和计量器具
E.操作机具