【单选题】检查维生素C中的重金属时,若取样量为1.0g,要求含重金属不得过百万分之十,问应吸取标准铅溶液( )多少ml?
【单选题】已知钠、钾等金属在常温下可与水发生剧烈反应,如金属钠与水反应的化学方程式为:2Na+2H 2 O===2NaOH+H 2 ↑,据此判断下列说法中错误的是 [ ]
B.
将石蕊试液滴入钠与水反应后的溶液中会变为蓝色
D.
在此反应中,钠与参加反应的水的质量比为1:1
【单选题】She is such a mean girl. She is always asking some questions.
【简答题】停放制动作为一种( )制动,用来防止机车停放时意外溜放。
【单选题】______ she is sick or not, she is always happy. [ ]
【单选题】关于恙虫病东方体,叙述错误的是()
C.
在0.5%苯酚溶液中或加热至56℃10min即死亡
【单选题】男,40岁,胫骨骨折石膏管型固定后8h,诉患肢疼痛难忍,检查:肢端苍白,温度降低,足趾不能主动活动,应考虑
【简答题】停车制动保护机车防止意外溜放(当机车关闭和不被占用时),停车制动作为一种()制动来实现。
【单选题】听力原文:W: Grace is so annoying, though she doesn't mean to hurt anybody. She is always correcting other people. She thinks she is a know-it-all. M: I feel the same way. Though sometimes her comments are...
D.
Intelligent but annoying.
【判断题】饭吃八分饱,活到九十九。吃饭要食不过量,就是吃饭不能吃到十成饱,要稍微少吃一点。