【简答题】A. ASian B. American C. European D. African
【简答题】A.Asian B.American C.European D.African
【单选题】Few Asian-American students major in human sciences mainly because ______.
A.
their English is not good enough
B.
they are afraid they might meet with unfair judgement in these areas
C.
there is a wide difference between Asian and Western cultures
D.
they know little about American culture and society
【多选题】建筑施工企业应当遵守有关的环境保护和安全生产的法律、法规的规定,采取控制和处理施工现场的各种( )的措施。
【单选题】青石棉(crocidolite)是世界卫生组织确认的一种致癌物质,是《鹿特丹公约》中受限制的46种化学品之一,青石棉的化学式为Na 2 Fe 5 Si 8 O 22 (OH) 2 ,青石棉用稀硝酸处理时,还原产物只有NO,下列说法中正确的是( )。
B.
青石棉的化学组成用氧化物的形式可表示为:Na 2 O·3FeO·Fe 2 O 3 ·8SiO 2 ·H 2 O
C.
1 mol Na 2 Fe 5 Si 8 O 22 (OH) 2 与足量的硝酸作用,至少需消耗8.5 L 2 mol·L -1 HNO 3 溶液
D.
1 mol Na 2 Fe 5 Si 8 O 22 (OH) 2 与足量氢氟酸作用,至少需消耗7 L 2 mol·L -1 HF溶液
【单选题】In recent years, teachers of introductory courses in Asian American studies have been facing a dilemma nonexistent a few decades ago, when hardly any texts in that field were available. Today, excelle...
A.
Recommending a methodology.
B.
Describing a course of study.
D.
Evaluating a past course of action.
E.
Responding to a criticism.
【单选题】青石棉(crocidolite)是一种致癌物质,是《鹿特丹公约》中受限制的46种化学品之一,其化学式为Na 2 Fe 5 Si 8 O 22 (OH) 2 。青石棉用稀硝酸溶液处理时,还原产物只有NO,下列说法不正确的是( )
C.
青石棉的化学组成可表示为:Na 2 O·3FeO·Fe 2 O 3 ·8SiO 2 ·H 2 O
D.
1 mol青石棉能使1 mol HNO 3 被还原