喷油泵出油阀按卸装方式分为等容和等压卸载两种。
参考答案:对
—— What can I do for you?
——I’d like to buy a gift for my mother’s birthday, one at _________ proper price but of ___________ use and it’d better be __________ surprise.
A.the; /; a
B.the; a ; /
C.a; the; /
D.a; / ; a
下列有关肿瘤的实验室检查叙述错误的是()
A.CEA在结肠癌、胃癌、肺癌均可升高
B.肝癌及恶性畸胎瘤者AFP均可升高
C.肝癌、骨肉瘤时血清AKP均可升高
D.肝癌及恶性淋巴瘤者乳酸脱氢酶降低
E.前列腺癌时酸性磷酸酶升高