【单选题】在美国,“自动执行条约”是()生效的条约。
【单选题】Disaster struck 250 million years ago, when the worst devastation in the earth's history occurred. Called the end-Permian mass extinction, it marks a fundamental change in the development of life. The...
【单选题】在美国 ,“ 自动执行条约 ” 是 _______ 生效的条约。
【单选题】Disaster struck 250 million years ago, when the worst devastation in the earth's history occurred. Called the end-Permian mass extinction, it marks a fundamental change in the development of life. The...
【单选题】非易燃或无毒介质的低压容器,应属于( )。
【简答题】His lectures on Roman history would do credit ________ a real expert. A) in B) to C) of D) with
【单选题】下列有关实验操作或叙述中,不正确的是
A.
用酸式滴定管量取25.00mL 1mol·L -1 的酸性高锰酸钾溶液
B.
配制一定物质的量浓度的NaOH溶液时,定容时俯视刻度线,结果将偏高
C.
配制100g20%的氯化钠溶液,必需的仪器有托盘天平,100mL容量瓶,烧杯,玻璃棒,胶头滴管
D.
浓硝酸保存在棕色玻璃试剂瓶中,氢氧化钠溶液保存在带橡皮塞的玻璃试剂瓶中
【单选题】Beijing O prea _____ a history of 200 years.