【名词&注释】
热稳定性(thermal stability)、苔藓植物(bryophytes)、元素周期律(periodic law of elements)、离子键(ionic bond)、含氧酸(oxyacid)、顶端优势(apical dominance)、原子核外电子排布、非金属元素(nonmetal elements)、从左到右(from left to right)、静电吸引力
[单选题]下列说正确的是
A. 形成离子键的阴阳离子间只存在静电吸引力
B. HF、HCl、HBr、HI的热稳定性和还原性均依次减弱
C. 第三周期非金属元素(nonmetal elements)含氧酸的酸性从左到右(from left to right)依次增强
D. 元素周期律是元素原子核外电子排布周期性变化的结果
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学习资料:
[单选题]
A. once
B. while
C. since
D. unless
[单选题]Just use this room for the time being, and we’ll offer you a larger one ____it becomes available.
A. as soon as
B. unless
C. as far as
D. until
[单选题]What does the pa mge mainly diseuss?
A. The present and pad times
B. Machin and human beings
C. Imaginations and inventions
D. Modem teehnology and its influenec
[单选题]We only had $100 and that was _______ to buy a new computer.
A. nowhere near enough
B. near enough nowhere
C. enough near nowhere
D. near nowhere enough
[单选题]茄、番茄花药开裂方式是( )。
A. 纵裂
B. 横裂
C. 孔裂
D. 瓣裂
[单选题]地钱的叶状体腹面(下面)的假根和鳞片具有吸收养分、保存水分和固定植物体的功能。( )
A. 正确
B. 错误
[单选题]具( )子房为多室子房。
A. 边缘胎座
B. 侧膜胎座
C. 中轴胎座
D. 特立中央胎座
[单选题]移栽菜苗时,一般将根除掉一截,目的是除掉顶端优势,促进侧根的发生。( )
A. 正确
B. 错误
[单选题]苔藓植物的孢子萌发首先形成( )。
A. 配子体
B. 原丝体
C. 孢子体
D. 芽体
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