( ) is the main layer in cell wall to provide mechanical support.
A: Primary wall
B: S1
C: S2
D: S3
A: Primary wall
B: S1
C: S2
D: S3
举一反三
- The wall of pollen grain is divided into two layers. A: primary wall and secondary wall B: pectin layer and primary wall C: outer wall and inner wall D: pectin layer and secondary wall
- The Romans built two walls to keep the picts out of the area they had conquered. The two walls were called ______ and ______. A: the picts’ Wall, Celts’ Wall B: the Hadrian’s Wall, the Antonine Wall C: Britain’s Wall, Scotland’s Wall D: Roman Wall, Julius’ Wall
- 平衡设计模式是() A: S(X-O) B: S(O1-O2-O3-X-O4-O5-O6) C: S1(O1-X-O2)S2(O3--O4) D: S1(X1-O1-X2-O2-X3-O3);S2(X1-O4-X2-O5-X3-O6);S3(X1-O7-X2-O8-X3-O9)
- 平衡设计模式是() A: S(X-O) B: S(O1-O2-O3-X-O4-O5-O6) C: S1(O1-X-O2)S2(O3--O4) D: S1(X1-O1-X2-O2-X3-O3);S2(X1-O4-X2-O5-X3-O6);S3(X1-O7-X2-O8-X3-O9)
- 已知: 则在横线处添加哪些代码b的值为true() A: s1==s B: s2==s C: s3==s D: s.equals(s1)