不得站在钻具上（）的方式或站在钻具中间滚钻具。
参考答案：用脚蹬踏
The soccer team has been doing well this season, so they _____ win the championship. [ ]
A. should
B. might
C. would
D. could
与肺癌发病关系最密切的因素是
A．职业性致病因素B．长期吸烟C．免疫缺陷D．慢性肺部疾病E．遗传因素
