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点焊工艺参数包括焊接电流、焊接时间、电极压力、电极端部直径等。()

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During the power stroke, a force of up to 4000 pounds is suddenly applied to the piston head for _______ times a second.
A 30
B 40
C 70
D 30 to 40

出具影像、病理、超声、心电图等诊断性报告的，必须是经执业注册的执业医师。()

行政机关可任意行使自由裁量权。()

______ is used to separate drive from the engine to gearbox and to allow a smooth, progressive take-up of drive.
A The clutch
B The transmission system
C The drum brake
D The shock absorber