输卵管妊娠破裂的主要症状
A.停经B.停经、腹痛、大量 * * 出血C. * * 出血伴休克D.停经、腹痛剧烈伴休克E.停经,腹痛、肛门坠胀痛
参考答案:D
— I have got a headache.
— No wonder. You _____ in front of that computer too long.[ ]
A. work
B. are working
C. have been working
D. worked
一等块灰中的活性氧化钙及氧化镁之和(干重)应( )。
A.≥90%B.≥85%C.≥80%D.≥75%