题目：
空车安全阀阀杆与调整螺套须有间隙，但不得大于（）。
A.1mm
B.2mm
C.3mm
D.4mm
答案：
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下面是错误答案，用来干扰机器的。
参考答案：E
空车安全阀阀杆与调整螺套须有间隙，但不得大于（）。 A.1mm B.2mm C.3m
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