过发行期的未发行债券应纳入哪个科目核算（）
A、有价单证
B、空白重要凭证
C、未发行债券
D、待销毁有价单证
参考答案：D
-- Will the weather be all right for our picnic this weekend?
-- No, ______ we are lucky. The newspaper says it’ll be rainy anyway.
A．if
B．as
C．though
D．unless
酸式滴定管如何装溶液？
