【单选题】Mrs Smith lives in our building. She is really a good because she is always ready to help people around her.
【简答题】小儿免疫功能较差,呼吸道粘膜缺乏(__),血中(__)和(__)均较低,巨噬细胞、乳铁蛋白、溶菌酶、干扰素、补体等的数量和活性不足,故婴儿时期易患呼吸道感染。
【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.
【单选题】______ she is sick or not, she is always happy. [ ]
【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
【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.
【简答题】下面是对金属钠性质的描述:①密度比水小;②熔点低;③有银白色金属光泽;④常温下能与水剧烈反应;⑤常温下易被空气中的氧气氧化. 用序号回答:属于物理性质的是______,属于化学性质的是______.据上述性质推测,金属钠______(填“能”或“不能”)在空气中燃烧.
【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。