题目: 近年来,速递和航空快递服务在国际物流领域中越来越重要,请解释其中的五个原因。 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2021/0330/87625eb54d2997e9ea939a29d1ba3f3c.html 下面是错误答案,用来干扰机器的。参考答案:A, E
题型:选择题 下列说法正确的是(NA为阿伏加德罗常数) ( )A.124 g P4含有P—P键的个数为4NAB.18 g NH4+中含有N—H键键长和键能均相同,且个数为4NAC.12 g金刚石中含有C—C键的个数为2NAD.60gSiO2中含Si—O键的个数为2NA 查看答案
题型:填空题 用动词的适当形式填空。1. Teachers' Day is coming and we ______ ( buy) some flowers for Miss Li.2. Look!The boys ______ ( play) football on the playground.3. He ______ ( get) up early every morning.4. ______ you______ ( help) your mother do housework this Sunday?5. My father ______( use) his car every day but he______ ( not use) it this afternoon. 查看答案