防止电梯剪切和坠落的保护装置有护脚板、门、_和门的验证关门装置
参考答案：门锁
100千克增加50%后，再减少50%是______．
Please tell me the way you thought of _______ the garden.[ ]
A. take care of
B. to take care of
C. taking care of
D. to take care
