实验研究中,常用下列哪项的温度作为深部温度的指标()。
A.肝脏
B.小肠
C.食道
D.血液
E.口腔
参考答案:C
________ eggs are there in the fridge? [ ]
A. How much
B. How many
C. How old
D. How often
1980年,青年职员所占比重比中老年职员少()
A.4%
B.8%
C.29.4%
D.20%