液力透平除了在检修时外,运行时和备用时出口阀均处于()状态。
A、全开
B、全关
C、自由决定
D、无技术要求
参考答案:A
阅读短文,判断正(T)误(F)。
" Jenny? " says Danny. " Where do I write the address on this postcard? "
" On the right." says Jenny.
" Oh, okay." says Danny. " Where is the right? "
" This is the right! " says Jenny.
" What's my mother's address? " asks Danny. " You live with your mother, Danny. Your address and her
address are the same."
" Oh, okay! "
( ) 1. Danny writes his address on the right of the postcard.
( ) 2. Danny lives with his mother, but their address are different.
( ) 3. Danny wants to send a letter to his mum.
( ) 4. Jenny tells Danny where to write the address.
酶桥染色法中的桥抗体是指()
A.免疫反应系统中的特异性抗体
B.显色系统中的抗酶抗体
C.第二抗体
D.第一抗体
E.以上均不对