妊娠几周后妊娠囊消失()
A.6周
B.7~8周
C.9~10周
D.11~13周
E.16周
参考答案:D
116. This pocket English dictionary cost me 2 US _____, that is more than 16 RMB _____.
A.dollars; yuans
B.dollar; yuan
C.dollar; yuans
D.dollars; yuan
药材大连湾牡蛎的性状是()
A.贝壳四方形,背缘平直,腹缘圆,单壳
B.贝壳呈长片状,背腹缘儿平行,右壳较平,左壳凹陷很深
C.贝壳呈类三角形,背腹缘呈八字形。右壳外淡黄色
D.贝壳呈圆形、卵形或三角形,右壳较小,表面环生同心鳞片
E.贝壳呈类三角形,背腹缘呈八字形。右壳外淡黄色,内面红黄色