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【多选题】
雌激素的生理作用有( )。A.
刺激并维持母畜生殖道的发育
B.
作用于中枢神经系统，诱导发情行为。但在绵羊和牛，这一作用还需孕激素的参与
C.
治疗因孕酮水平降低引起的习惯性流产
D.
促进乳腺管状系统的生长发育，与孕酮共同刺激并维持乳腺的发育
E.
治疗对公畜睾丸发育不良和阳痿
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【单选题】水闸运行记录表中，闸门运行的运行过程中，存在问题及处理措施的记录应当记录：（ ）
A.
出现异常现象
B.
处理措施
C.
出现异常现象或处理措施
D.
出现异常现象或处理措施
【单选题】Mr Black was doing shopping at the supermarket ______ his mobile phone rang. [ ]
A.
when
B.
while
C.
after
D.
until
【简答题】阅读理解。 Americans wear black for mourning while Chinese wear white. Westerners think of dragons as monsters. Chinese honor them as symbols of God. Chinese civilization has often shown such polarities (对...
【简答题】阅读理解。 Americans wear black for mourning while Chinese wear white. Westerners think of dragons as monsters while Chinese honor them as symbols of God. Chinese civilization has often shown such polariti...
【简答题】阅读理解。 Many people take it for granted that black is a color of bad things while white should always mean something good. This may be because, in their opinion, black is related to darkness and white t...
【单选题】Mrs. Black had her left hand ______while cooking.
A.
burned
B.
burn
C.
to burn
D.
burning
【单选题】下列选项中,属于仲裁协议中约定的有效条款的有( )。
A.
仲裁协议约定的两个仲裁机构，且当事人不能就仲裁机构选择达成一致
B.
当事人约定争议可以向仲裁机构申请仲裁，也可以像人民法院起诉
C.
劳动合同约定发生劳动争议向北京仲裁委员会申请仲裁
D.
双方因履行合同发生纠纷向北京仲裁委员会申请仲裁
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