能用推进器使自身横向移动的拖船种类为:()
A.CPP、VSP、ZP、FPP
B.ZP、VSP
C.VSP、FPP、CPP
D.ZP、FPP、VSP
参考答案:B
影响峰值骨量和骨转换的基因有()
A.α2受体基因
B.维生素D受体基因
C.α1受体基因
D.β2肾上腺素能受体基因
E.雌激素受体基因
This is ______ key, and that is ________ orange.
A. a; a B. a; an C. an; an