影响果实增长的因素有哪些?
参考答案:
(1)细胞数目和体积;
(2)有机营养;
(3)无机营养;
(4)激素;
(5)种子;
(6)环境条件。
血清学诊断的用途是()
A.确定病原菌的群
B.确定病原菌的种
C.确定病原菌的型
D.检测病原菌的耐药性
—Mum, I’ve been studying English since 8 o’clock. ________ I go out and play with Tom for a while?
—No, I’m afraid not. Besides it’s raining outside now.
A.Can’t
B.Wouldn’t
C.May not
D.Won’t