单项选择题 “风来疏竹，风过而竹不留声；雁渡寒潭，雁去而潭不留影。故君子事来而心始现，事去而心随空。”这句话主要强调（ ）。

多项选择题 末端试水装置开启后，哪些组件和喷淋泵应动作？ A 水流指示器 B 水力警铃 C 闭式喷头 D 压力开关 E 湿式报警阀

单项选择题 "Wife", which used to refer to any woman, stands for "a married woman" in modern English. This phenomenon is known as ______.A.semantic shiftB.semantic broadeningC.semantic elevationD.semantic narrowing