In an Audioligual classroom, a____is usually presented and memorized before specific grammar patterns are picked out from it and later become the focus of drill exercises
在S—Cl,Si—Cl,Al—Cl,P—Cl四种化学键中,键的极性最大的是Si—Cl键。( )
判断char型变量cl是否为大写字母的正确表达式是
A.′A′<=cl<=′Z′
B.(cl>=A)&&(cl<=Z)
C.(′A′>=cl)||(′Z′<=cl)
D.(cl>=′A′)&&(cl<=′Z′)
试用电负性值估计下列键的极性顺序:
H—Cl、Be—Cl、Li—Cl、Al一Cl、Si—Cl、C—Cl、N Cl、O—Cl
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