犬的妊娠期是A.30~31天B.45~52天左右C.58~63天左右D.70-72天左右
犬的妊娠期是
A.30~31天
B.45~52天左右
C.58~63天左右
D.70-72天左右
参考答案和解析
B
相关考题:
下列哪项是犬的正确抓法( )。A、用犬夹夹住头部,使犬头向下,再套上犬链B、用犬夹夹住颈部,使犬头向上,再套上犬链C、用犬夹夹住颈部,使犬头向下,再套上犬链D、用犬夹夹住头部,使犬头向上,再套上犬链E、用犬夹夹住颌部,使犬头向下,再套上犬链
单选题下列哪项是犬的正确抓法()。A用犬夹夹住头部,使犬头向下,再套上犬链B用犬夹夹住颈部,使犬头向上,再套上犬链C用犬夹夹住颈部,使犬头向下,再套上犬链D用犬夹夹住头部,使犬头向上,再套上犬链E用犬夹夹住颌部,使犬头向下,再套上犬链
单选题犬的正确抓法是()A用犬夹夹住颈部,使犬头向上,再套上犬链B用犬夹夹住头部,使犬头向上,再套上大链C用犬夹夹住颈部,使犬头向下,再套上犬链D用犬夹夹住头部,使犬头向下,再套上犬链E用犬夹夹住颌部,使犬头向下,再套上犬链
单选题犬阴道增生脱出多发生在()A发情期B妊娠期C子宫开口期D胎儿产出期E胎衣排出期