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【单选题】
关于电梯门锁装置锁紧元件啮合能力检查方式的下列叙述哪些是正确的？（）A.
沿开门方向，作用300N力的情况下，不降低锁紧效能。
B.
对于滑动门，沿开门方向，作用1000N的情况下，不降低锁紧效能。
C.
对于铰链门，沿开门方向，作用3000N的情况下，不降低锁紧效能。
D.
沿门开启方向进行一次冲击试验。其冲击相当于一个4kg的刚性体从0.5m高度自由下落所产生的效果。
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