由于附睾中精液偏酸性,因此射出体外的牛羊精液呈偏酸性。
参考答案:错
The first thing ________ I did was to see if there were any products ________ might help me, but there only seemed to be powders ________ to kill snakes.
A.that; /; designed
B.which; that; designed
C./; that; designed
D./; which; design
引起水轮机振动的机械因素