关于重症肌无力的阐述哪项是错误的()
A.用抗胆碱酯酶药物有效
B.部分或全身骨骼肌易疲劳
C.腾喜龙试验阴性
D.活动后加重,休息后减轻和晨轻暮重
E.是自身免疫性疾病
参考答案:C
__________cleaning the yard and making up the beds for the old, we also read newspapers for them
and had chats with them. [ ]
A. Except for
B. Rather than
C. Apart from
D. Instead of
收寄国内挂号信函时,应验视其重量是否超过()。
A.500克
B.1000克
C.2000克
D.5000克