()是最常用的血液抗凝剂。
A.肝素
B.草酸钾
C.枸橼酸盐
D. EDTA钠盐
参考答案:B
根据下面的图判断句子的正误,正确的写T,错误的写F。
( ) 1. My mother is wearing pants.
( ) 2. My grandfather is wearing a hat.
( ) 3. My grandmother is wearing a skirt.
( ) 4. My father is wearing a sweater.
( ) 5. I am wearing pants and a skirt.
超过90m高的2级土石坝设计时()。
A.按1级设计
B.按2级设计
C.洪水标准不变
D.洪水标准提高