井下起吊时人员不应站在什么位置？
参考答案：必须躲开链子三角区，重物下方及可能坠落的范围。
They have decided to show the children around the small town because the brightly colored houses there appeal _____ children .
A．to
B．for
C．against
D．with
潜能开发法适用于什么时候？
