乳糜微粒生成部位是()。
A.贮能和供能
B.磷脂、胆固醇和不饱和脂肪酸
C.前列腺素、血栓恶烷及白三烯
D.胆汁酸盐、辅脂酶与胰脂酶
E.小肠
参考答案:E
由+1H、-2O、+4C、+1Na四种元素,按指定化合价最多可以组成化合物的种数有( )
A.7种
B.6种
C.5种
D.4种
If nature does not provide man with the necessary material, it is the laboratory ____ he will turn to for it. [ ]
A. where
B. that
C. which
D. what