【单选题】Which of the following are meaningful criteria for measuring the effectiveness of an appraisal scheme? (i) Serious intent (ii) Fairness (iii) Efficiency (iv) Co-operation (v) Results
A.
(ii), (iii) and (v) only
C.
(i), (ii), (iii) and (iv) only
D.
(i), (ii), (iii), (iv) and (v)
【单选题】_____ the end of the day, the science teacher was very happy.
【判断题】III类电动工具,其额定电压不超过50V。( )
【单选题】下列中 _____ 是具有同素异构的元素 。 I、Fe;II、Cu;III、V;IV、Zn;V、C;VI、Sn 。
【单选题】What is the correct order for the stages of the product life cycle? (i) Growth (ii) Decline (iii) Maturity (iv) Development (v) Introduction
A.
(i), (v), (iii), (iv), (ii)
B.
(v), (iv), (i), (iii), (ii)
C.
(iv), (v), (i), (iii), (ii)
D.
(iv), (i), (iv), (iii), (ii)
【单选题】Reporters often express concern about pressure from ____________.
【单选题】— the doctors, the most beautiful teacher Zhang Lili is out of er. —We wish her to live a healthy and happy life in the future.
【单选题】随着核电荷数的递增,氧化性逐渐减弱的一组是 [ ]
【简答题】在数学课上,同学们研究图形的拼接问题. 比如:两个全等的等腰直角三角形纸片既能拼成一个大的等腰直角三角形(如图1),也能拼成一个正方形(如图2). (1)现有两个相似的直角三角形纸片,各有一个角为 ,恰好可以拼成另一个含有30°角的直角三角形,那么在原来的两个三角形纸片中,较大的与较小的纸片的相似比为________,请画出拼接的示意图; (2)现有一个矩形恰好由三个各有一个角为 的直角三角形纸片...
【简答题】说明卤素单质的熔点、沸点随原子序数增加而递增的原因。 F 2 Cl 2 Br 2 I 2 m.p./ °C - 200 - 101 - 7 113.5 b.p./ °C - 188 - 35 59 184