下列说法或关系式正确的是（ ） A．已知①H2（g）+12O2（g）=H2O（g

用所给单词的正确形式填空。

1. The old should be spoken to ______ (polite).

2. My family lives in the ______ (center) park of the city.

3. He is too ______ (care) to pass the final exam.

4. Poetry is a beautiful way to express ______ (think) and feelings.

5. Children's ______ (expect) ideas often surprise the adults.

6. Betty is often seen ______ (help) the old man with his housework.

7. He prefers ______ (take) part in the public activities rather than stay at home alone.

8. They ______ (agree) with each other, so they argued for a long time.

9. Animals are our friends, so ______ (protect) them is our duty.

10. You have ______ (award) a scholarship to study violin at our School of Music.

关于遗传性疾病，正确的是（）。

A.具有垂直性和终生性

B.是个体细胞发生改变

C.是生殖细胞发生改变

D.受精卵有改变

E.是个体生殖细胞或受精卵的遗传物发生突变

招标工程标底价格要按照工程造价管理部门规定的定额和有关政策制定，标底价格受国家批准的工程概算控制，这种价格的形成特征属于我国建筑产品价格市场化过程中经历的()。

A．国家定价阶段

B．国家指导价阶段

C．施工单位定价阶段

D．国家调控价阶段

患者男性，42岁。不规则低热3个月，厌食，体重下降5kg，右季肋下胀痛，巩膜轻度黄染，面部有三个蜘蛛痣，肝肋下3.5cm，质硬，表面不平，脾肋下1cm，肝区可闻及血管杂音，白细胞：5.8×109／L，中性：0.64，谷丙转氨酶：130U／L，碱性磷酸酶：30U／L。经中西医治疗无效。应诊断为()

A.慢性活动性肝炎

B.原发性肝癌

C.门脉性肝硬化

D.肝脓肿

E.肝血管瘤

户外变压器加装防雨罩，本体及二次电缆进线（）应被遮蔽，45°向下雨水不能直淋。

A.30mm

B.40mm

C.50mm

D.60mm