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【单选题】
某溶液加甲基橙呈黄色,加酚酞呈无色,则其pH值范围为A.
<3.1< /div>
B.
3.1-4.4
C.
4.4-8.0
D.
>8.0
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【简答题】[填空1] [填空2] [填空3] [填空4] v. 加快,促进 ac ci le rite ce rate
【单选题】Lindbergh suddenly felt hungry when he came down to Le Bourget most probably because ______.
A.
he had forgotten to prepare food for the flight
B.
fatigue had made him forget hunger earlier before landing
C.
jet lag caused his sudden hunger
D.
total concentration on the flight had stopped him from feeling hunger
【简答题】Please write down the noun of flexib le ._______________
【单选题】下列哪些是可以堪看成随机变量的
A.
某地区夏季的气温
B.
某河流某月的径流量
C.
某地震带上的城市在一个月内发生5级以上地震的次数
D.
某沿海城市一年内受台风侵袭的次数
【简答题】液柱压力计量是基于 原理的测压装置,用U形管压差计测压时,当一端与大气相通时,读数R表示的是 或 。
【单选题】It is difficult to narrow down the present digital divide because ___________
A.
leaders of poor countries have no development plan for their countries
B.
poor countries have no money to buy computers and the Internet equipment
C.
the poor country invest less on computer than on food
D.
world leaders are more concerned about such challenges as peace or disarmament
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