关于导管的说法中,错误的一项是( )
A.组成导管的细胞为长形
B.组成导管的细胞呈管状
C.组成导管的细胞具有细胞质
D.组成导管的细胞两端没有横壁
答案:C
He was unlucky because he failed the exam.
A.He was bad because he failed the exam.
B.He was lucky because he passed the exam.
C.He was unhappy because he failed the exam.
D.He was not lucky because he failed the exam.
第(6)题中指令INT 21H是 【8】 中断。