垂体嗜酸性细胞分泌（）.
A.催产素和生长激素
B.生长激素和催乳激素
C.生长激素和促性腺激素
D.生长激素和促甲状腺激素
参考答案：B
发电厂运来一批煤，计划每天用30吨，12天用完，实际每天节约6吨煤，实际比计划多用了多少天？（用比例解答）
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