人体的营养必需氨基酸是()
A.丙氨酸
B.甲硫氨酸
C.谷氨酸
D.天冬氨酸
E.丝氨酸
参考答案:B
Sometimes it was a bit boring to work there because there wasn't always ______ much to do. [ ]
A. such
B. that
C. more
D. very
测土的比重时,土的质量与比重瓶的容积应满足下列条件()
A、15g,100mL
B、10g,50mL
C、15g,50mL
D、10g,100mL