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【单选题】
Solution A and B are separated by a semipermeable membrane that is permeable to K + but not to Cl - . Solution A is 100mM KCl , and solution B is 1mM KCl . Which of the following statements about solution A and solution B is true ?A.
K + ions will diffuse from solution A to solution B until the [K + ] of both solutions is 50.5mM
B.
K + ions will diffuse from solution B to solution A until the [K + ] of both solutions is 50.5mM
C.
KCl will diffuse from solution B to solution A until the [K + ] of both solutions is 50.5mM
D.
K + will diffuse from solution to A solution B until a membrane potential develops with solution A negative with respect to solution B
E.
K + will diffuse from solution to A solution B until a membrane potential develops with solution A positive with respect to solution B
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【多选题】混凝土运输的要求包括下列哪几项( )。
A.
混凝土在运输过程中可以出现离析现象
B.
混凝土应以最少的转运次数、最短的时间，从搅拌地点运至浇筑地点
C.
运输工作要保证混凝土的浇筑工作连续进行
D.
运至浇筑地点后，应符合坍落度的要求
E.
粘附的混凝土残渣可以存留
【简答题】将初始温度为400°C,半径为15mm的铝球突然抛入15°C的空气中。已知对流传热表面传热系数h=40 W/m 2 ·K,铝的物性参数为ρ=2700kg/m 3 ,c=0.9 kJ/kg·K,λ=240 W/m·K。试确定该铝球由400°C降至100°C所需的时间。(忽略辐射换热)
【简答题】起初,这个复杂的问题使他们感到灰心丧气,但经过仔细思考后,他们终于研究出了解决办法。
【简答题】数字通信系统的主要质量指标?
【单选题】某饭店，当日预订房间200间，延长退房率4%，预期退房75间，临时取消率8%，预订员当日可以超额预订（ ）间客房______
A.
14
B.
13
C.
13.5
D.
14.5
【简答题】______ this complicated problem ______ them, but after ________ carefully they finally worked out a solution.起初,这个复杂的问题使他们感到灰心丧气,但经过再三仔细思考后,他们终于研究出了解决办法。
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