各操作台面踏板漏洞不得大于（）mm；
A、30
B、50
C、40
D、60
参考答案：B
34. He had no sooner arrived there ________ pestering his doctor.
A．and then he began
B．when he began
C．to begin
D．than he began
（）不属于战略分析工具。
A.SWOT
B.PEST
C.SMART
D.价值链分析
