关于高渗性脱水，下列叙述哪项不妥（） ["多见于不显性失水增多而给水不足","烦躁不安、肌张力增高甚至惊厥","细胞内液减少明显","尿少比重增高","脱水征比其他两种脱水明显，易出现循环障碍"]
胃肠道的恶性肿瘤经血道首先转移到（） ["肺","血癌","肝","肾","脑"]
属于全封闭式密封的泵是（）。 ["A.磁力偶合泵和屏蔽泵 ","B.离心泵和磁力偶合泵 ","C.屏蔽泵和往复泵 ","D.柱塞泵和螺杆泵"]
清晰度在85%以上时，可得到满意的通话质量，低于（）就不能令人满意了。 ["50%","60%","70%","80%"]
造血组织的恶性肿瘤统称为（） ["霍奇金病","血癌","白血病","血管内皮肉瘤","以上都不是"]
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