【单选题】函数uint16_t SCI_putDataNonBlocking(SCI_Handle sciHandle, uint16_t data)实现的功能是( )。
A.
等待 TXRDY=0 ,把数据写入发送缓冲寄存器
B.
等待 TXRDY=1 ,把数据写入发送缓冲寄存器
C.
判断 TXRDY 状态,如果允许发送,就把数据写入发送缓冲寄存器。否则退出,并返回错误值
D.
判断 TXRDY 状态,如果不允许发送,就把数据写入发送缓冲寄存器。否则退出,并返回错误值
【单选题】对于已设置了修改权限密码的文档,如果不输入密码,该文档( )。
【单选题】T he author’s attitude towards his topic can best be described as _____.
【单选题】Armstrong's quote is utilized in the last paragraph because______.
A.
it exemplifies the attitude of the nations as a result of the Space Race
B.
it is important to hear and understand the words of the pioneers who took part in the project
C.
it summarizes the philosophy that the author is attempting to convey in the text
D.
it defied all expectation and signaled a great step forward for technology
【单选题】Why does Michelle Obama hold a strong fascination for the author?
A.
She will pay closer attention to the interests of African-American women.
B.
She will present to the world a new image of African-American women.
C.
She possesses many admirable qualities becoming a First Lady.
D.
She serves as a role model for African women.
【判断题】学习通里的课程可以通过PC端(台式电脑)学习。
【判断题】这个消息处理函数UINT16 GenericApp_ProcessEvent(byte task_id,UINT16 events) { } 是一个空函数。