红细胞的发育过程是 ["A．原始红—中幼红—早幼红—晚幼红—网织红—成熟红细胞","B．原始红—早幼红—中幼红—晚幼红—网织红—成熟红细胞","C．早幼红—原始红—中幼红—晚幼红—网织红—成熟红细胞","D．早幼红—原始红—晚幼红—中幼红—网织红—成熟红细胞","E．原始红—早幼红—晚幼红—中幼红—网织红—成熟红细胞"]
动脉血的pH为 ["A．7．30","B．7．35","C．7．40","D．7．45","E．7．50"]
分部（子分部）工程验收时，供电干线安装工程分项工程的检验批，依据供电区段和电气线缆竖井的编号划分；避雷引下线安装（）层以下的建筑为1个检验批，高层建筑依均压环设置间隔的层数为1个检验批。 ["A、2 ","B、4 ","C、5 ","D、6 "]
不间断电源正常运行时产生的A声级噪声，不应大于（）dB ["A、60","B、55","C、50","D、45"]
潜水的特点。
承压水的特点。
