装卸搬运辅助作业工具中的索具主要有钢丝绳、夹具、卡具和（）等。
A、网兜
B、倒链
C、托盘
D、断线钳
参考答案：A
Tommy was planning to buy a car the next week,______ he ______ enough for a used one．
A．by that time; had saved
B．by which time; had saved
C．by that time; saved
D．by which time; has saved
组织的形成来自于细胞的（ ）
A．生长
B．发育
C．分裂
D．分化
