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【单选题】
配合物的 d-d 跃迁光谱一般出现在哪一区域?( )A.
远紫外区
B.
近紫外 - 可见区
C.
红外区
D.
微波区
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】— There'ssomeone knocking on the door. Who _____it be? — It must be Mary. She promised to be here at 8：00.
A.
must
B.
need
C.
shall
D.
Can
【单选题】— There's someone outside. Who it be ? — It must be Mary. She promised to come over at 8: 00.
A.
must
B.
can
C.
shall
D.
need
【单选题】It is no use________without doing.
A.
to promise
B.
promising
C.
promise
D.
to be promised
【单选题】有关土壤热特性的描述,不正确的是( )。
A.
在获得相等的热量下，容积热容量大的土壤，升温多
B.
土壤导热率越大，土壤容积热容量越小，土壤导温率就越大，土壤温度变化越快
C.
热容量随土壤湿度增加而增大，随土壤孔隙增加而减小
D.
土壤导热率随土壤湿度增加而增大，随土壤孔隙度增加而减小
【单选题】---There’s someone knocking on the door. Who _________ it be? ---It must be John. He promised to be here at 8:00.
A.
must
B.
can
C.
need
D.
shall
【单选题】—There's someone knocking on the door．Who it be? —It must be Mary．She promised to be here at 8：00．
A.
must
B.
can
C.
shall
D.
need
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