低位肠梗阻呕吐的特点 ()
A.呕吐物为血性
B.呕吐早、频繁
C.呕吐出现晚、呕吐物带粪臭味
D.呕吐物为带酸臭味的宿食
E.呕吐呈溢出性
参考答案:C
The water ______ cool when I joined into the pool for morning exercise. [ ]
A. was felt
B. is felt
C. feels
D. felt
用硝酸银滴定法,以铬酸钾作指示剂,测水中氯化物时,水样pH的范围应是()。
A.7~10
B.2~4
C.12以上
D.10~12
E.4~6