单项选择题

Which of the following descriptions is INCORRECT? ( )

A．The affinity mutation of antibody is mainly the result of somatic hypermutation and selection in the geminal center.
B．Class switching allows the selected B cells to produce antibodies with a variety of effector functions.
C．Follicular dendritic cells and T follicular helpers are important for B cells to produce a more effective antibody response.
D．Follicular dendritic cells are richly endowed with both Fc receptors and complement receptors to accumulate the antigens for B cells binding.
E．The generation of antibody diversity mainly occurs in the germinal center.

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多项选择题

A key issue in the "millennium round" of the WTO was not to: ( )
A. increase barriers to cross-border trade in agricultural products.

B. extend GATT to cover trade in commodities.

C. further reduce barriers to cross-border trade and investment.

D. extend GATT rules to cover trade in services.

问答题

单层工业厂房屋面板的安装顺序，应自逐块铺向以避免屋架受荷不均匀。

答案： (1)
两边檐口左右对称地 ...

Which of the following descriptions is INCORRECT? ( )

你可能感兴趣的试题

A key issue in the "millennium round" of the WTO was not to: ( ) A. increase barriers to cross-border trade in agricultural products. B. extend GATT to cover trade in commodities. C. further reduce barriers to cross-border trade and investment. D. extend GATT rules to cover trade in services.

单层工业厂房屋面板的安装顺序，应自 逐块铺向 以避免屋架受荷不均匀。

A key issue in the "millennium round" of the WTO was not to: ( )
A. increase barriers to cross-border trade in agricultural products.

B. extend GATT to cover trade in commodities.

C. further reduce barriers to cross-border trade and investment.

D. extend GATT rules to cover trade in services.

单层工业厂房屋面板的安装顺序，应自逐块铺向以避免屋架受荷不均匀。