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【简答题】
目前人类面临的两大类环境问题是什么?
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举一反三
【简答题】In Yugoslavia, the late 1960s and early 1970s were marked by improved relations with other countries, regardless of their political ______. (orient)
【简答题】氟离子选择性电极是晶体膜电极吗?使用条件?
【单选题】对CH 3 Br进行亲核取代时,以下亲核试剂亲核性的比较,正确的是:
A.
HS - < H 2 S
B.
H 2 O < HF
C.
HO - < HS -
D.
RO - < RCOO -
【单选题】新斯的明治疗重症肌无力的机制是
A.
兴奋大脑皮质
B.
抑制胆碱酯酶和直接激动骨骼肌N2胆碱受体
C.
促进乙酰胆碱合成
D.
激动骨骼肌M胆碱受体
E.
促进骨骼肌细胞Ca2+内流
【单选题】对 CH 3 Br 进行亲核取代时,以下离子亲核性最强的是( )
A.
CCl 3 CH 2 O -
B.
CH 3 CH 2 O -
C.
C 6 H 5 O -
D.
CH 3 COO -
【单选题】新斯的明治疗重症肌无力的机制是
A.
兴奋大脑皮层
B.
激动骨骼肌M胆碱受体
C.
促进乙酰胆碱合成
D.
抑制胆碱酯酶和激动骨骼肌N M 胆碱受体
E.
促进骨骼肌细胞Ca 2+ 内流
【单选题】患者女性,30岁,于今日顺产一健康男婴,护士对其进行健康教育时,最重要的内容是
A.
避免乳汁淤积
B.
多饮水
C.
保持乳头清洁
D.
纠正乳头内陷
E.
注意婴儿口腔卫生
【单选题】新斯的明治疗重症肌无力的机制是
A.
兴奋大脑皮质
B.
激动骨骼肌M胆碱受体
C.
促进乙酰胆碱合成
D.
抑制胆碱酯酶和激动骨骼肌N 2 胆碱受体
E.
促进骨骼肌细胞Ca 2+ 内流
【单选题】It can be inferred from the passage that in the early 1800’s children were generally regarded by their families as individuals who______
A.
needed enormous amounts of security and affection
B.
required constant supervision while working
C.
were important to the economic well-being of a family
D.
were unsuited to spending long hours in school
E.
were financial burdens assumed for the good of society
【简答题】In the early 1950s the researchers who produced the first clad glass optical fibers were not thinking of using them for communications.【46】H______, fiber optics was already a well-established commerci...
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