()在腌制时对肉起呈色和防腐作用。
A、抗坏血酸
B、磷酸盐
C、硝酸盐
D、发色剂
参考答案:C
He said that not until the heavy snow blocked the express _________ how serious the weather was.
A.did the tourists realize
B.the tourists realized
C.the tourists did realize
D.didn’t the tourists realize
小儿出生后主要造血场所是
A.肝脏
B.骨髓
C.脾脏
D.淋巴结
E.胸腺