Women _______ cancer is caused by the infection of human papillomavirus. Vaccine injection for young girls before they become sexually active can prevent it.
A.
breast
B.
cervical
C.
uterus
D.
viginal
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【单选题】The manipulation on the right picture is ( ) manipulation of shaking shoulder
A.
manipulation of shaking shoulder by rotating shoulder substantially
B.
manipulation of shaking shoulder by supporting the elbow as rotating the shoulder
C.
manipulation of shaking shoulder by holding the elbow as rotating the shoulder
【简答题】(16分)硫代硫酸钠(Na 2 S 2 O 3 )是最重要的硫代硫酸盐,俗称“海波”,又名“大苏打”。易溶于水,不溶于乙醇。在棉织物漂白、定量分析中有广泛应用。 某校化学研究性学习小组运用类比学习的思想,通过实验探究Na 2 S 2 O 3 的化学性质。 【样品制备】实验室中常用亚硫酸钠和硫磺制备Na 2 S 2 O 3 ·5H 2 O。写出反应的化学方程式 ; 反应液经脱色、过滤、浓缩结晶、过滤...