果蝇的红眼(W)对白眼(w)为显性。让红眼果蝇与白眼果蝇交配，其后代是红眼雄果蝇

长期肠外营养支持者，宜选用下列哪条血管穿刺抬管（）。

A.颈内静脉

B.大隐静脉

C.颈外静脉

D.足背静脉网

E.桡动脉

小明从家到学校上学，要走1.3千米．一天上学，他走了0.3千米后发现没带数学作业本，又回家去取，这样他比平时上学多走了______米．

According to the passage, the author likes being with those______.

A．fat people who are clumsy and slow in movement and gets fed up with those quick and sensitive thin people

B．thin people who are always energetic and active and those fat people, too, who are steady in the moves they take

C．fat people who are inactive and easily get jaded but hates to be among those thin people who are active and energetic

D．thin people who get rid of things quickly but feels sick of those fat people who are all thumbs

M7475B、磨床电磁吸盘退磁时，YH中电流的频率等于（）。

A、交流电源频率

B、多谐振荡器的振荡频率

C、交流电源频率的两倍

D、零

将人格分为内向型和外向型的是（）

A、荣格

B、谢尔顿

C、威特金

D、霍兰德