小学低年级儿童常常要在家长的督促下完成作业或活动任务,这体现了低年级儿童意志的()水平较低。
A. 自觉性
B. 果断性
C. 自制性
D. 坚持性
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“鱼和熊掌不能兼得”属于()。
A. 双趋冲突
B. 双避冲突
C. 趋避冲突
D. 多重趋避冲突
对于正态分布而言,Zα=2Zα/2。
A. 对
B. 错
Give the corresponding English term according to each definition.1. a chamber of the heart that receives blood from the atrium____________2. an abnormally low rate of heartbeat____________3. the membrane that lines the cavities of the heart and forms part of the valves____________4. a sac formed by abnormal dilation of the weakened wall of a blood vessel____________5. the dilatation of the chambers of the heart____________6. the innermost layer of the pericardium____________7. a type of granular leukocyte that functions in the ingestion of bacteria____________8. one of the minute blood vessels that connect arterioles and venules____________9. the iron-containing respiratory pigment in red blood cells of vertebrates____________10. the main vessel in the arterial network____________