___和____之间有形成层。形成层的细胞能不断地____形成新的__________细胞和____细胞，使茎不断长粗。
木质部 韧皮部 分裂 木质部 韧皮部
根据短文判断正 （T）误 （F）。
This is a picture of Mr Black's family. There are four people in the family. They are Mr Black,
Mrs Black, Jim and Kate. Look at the picture. We can see Jim is behind Mr Black. Kate is behind
Mrs Black. Jim and Kate are students. They go to the same school. Mr Black and Mrs Black are
teachers. They are good teachers. They go to work by car.
( ) 1. Jim is Mr Green's son.
( ) 2. There are five people in Mr Black's family.
( ) 3. Jim and Kate are students.
( ) 4. Jim and Kate are in the same school.
( ) 5. Mr and Mrs Black go to work by bus.
下列估价方法中，不需要详细的工程设计资料，只知道工艺流程及规模就可以，在总承包工程报价时，承包商大都采用( )进行估价。
A．单位生产能力估算法
B．生产能力指数法
C．系数估算法
D．比例估算法
