【判断题】【消耗次数：1】
交感神经对心脏的影响一般表现为收缩加强，而心率减慢。
①
正确
②
错误
参考答案：
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相关题目
【单选题】
关于心交感神经对心脏的作用，下列叙述错误的是（）
①
末梢释放的递质是去甲肾上腺素
②
心肌细胞膜上的受体是β受体
③
可导致正性变时、变传导、变力作用
④
使心室舒张末期容积增大
⑤
使心室搏出的血量增多
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工业上获取丁二烯的主要方法有：从烃类裂解制乙烯的联产物碳四馏分分离得到、由丁烷或丁烯催化脱氢法制取和( )氧化脱氢法制取三种。
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二丁烯
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乙烯
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mso-ascii-theme-font:minor-latin;mso-fareast-theme-font:minor-fareast;
mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Times New Roman
mso-bidi-theme-font:minor-bidi;mso-ansi-language:EN-US;mso-fareast-language:
ZH-CN;mso-bidi-language:AR-SA;mso-bidi-font-weight:bold">画局部视图时，应在基本视图上标注出
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投射方向
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名称
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投射方向和相应字母
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不标注
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化工制图中图线宽度分粗、中粗、细三种，若粗实线的宽度为d，则细实线的宽度为( )。
①
Normal
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7.8 磅
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2
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EN-US
ZH-CN
X-NONE
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②
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