肝硬化时，肝脏解毒功能下降表现为
A．男性乳腺发育B．食管静脉曲张C．氨中毒D．凝血因子减少E．黄疸
参考答案：C
. — Is there a ____ to the time that I can stay here?
— Yes, you must leave here before he comes back.
A．number
B．length
C．limit
D．Matter
参数检验与非参数检验各有哪些优缺点，如何正确选用两种方法？
