A:哥伦布
B:库克
C:麦哲伦
D:郑和
当如图为西半球且为昼半球时,读图(空白部分为昼半球),回答下题.
The house was ____ ____ by the thief when they went out for a travel.
氯元素有多种盐类,其中亚氯酸钠(NaClO2)亚氯酸钠受热易分解.以氯酸钠等为原料制备亚氯酸钠的工艺流程如下:
请回答下列问题: