疏松结缔组织中韧性大,抗拉力强的纤维是(),在银染中才能显示的纤维是()。
参考答案:胶原纤维,网状纤维
Do you often say “________” to your parents before you go to bed? [ ]
A. Good evening.
B. Goodbye.
C. Going to bed.
D. Good night.
下列四种物质中,能用于区别稀硫酸、食盐水和烧碱溶液的是( )
A.紫色石蕊试液
B.锌粒
C.无色酚酞溶液
D.盐酸