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【简答题】
共沸蒸馏法测定样品中的水分时,常用的有机溶剂有();()、二甲苯。
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A.
叶柄
B.
叶片
C.
鳞叶
D.
刺状叶
E.
叶卷须
【多选题】旅游电子商务时代旅行社的发展趋势是()
A.
大型旅行社集团化
B.
中型旅行社专业化
C.
小型旅行社通过代理制实现网络化
D.
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【单选题】在标定某溶液浓度时,某同学的4次测定结果分别为0.1018mol/L、0.1017mol/L、0.1018mol/L、0.1019mol/L,而准确浓度为0.1036mol/L,该同学的测量结果为
A.
准确度较好,但精密度较差
B.
准确度较好,精密度也好
C.
准确度较差,但精密度较好
D.
准确度较差,精密度也较差
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【多选题】关于精液排出的过程,下列描述正确的是( )。
A.
交配时,尿道起始部内壁上的精阜勃起,阻断膀胱的排尿通道,并防止精液向膀胱倒流。
B.
尿道球腺分泌少量液体,冲洗并润滑尿道。
C.
附睾尾经由输精管向骨盆部尿道排出浓密的精子,同时各副性腺向骨盆部尿道排出各自的分泌物与精子混合构成精液。
D.
精液流经骨盆部尿道和阴茎部尿道,射入母畜生殖道或假阴道内。
E.
在此过程中,附睾管、输精管和尿道的管壁上都有一层环形的平滑肌,在神经的支配下,发生节律性收缩,为精液的排出提供动力。
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